题目内容
若计算机存储数据采用的是双符号为（00表示正号、11表示负号），两个符号相同的数相加时，如果运算结果的两个符号位经 （3）运算得1，则可断定这两个数相加的结果产生了溢出。
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There is nothing in this world constant but inconstancy．--SWIFT
Project after project designs a set of algorithms and then plunges into construction of customer-deliverable software on a schedule that demands delivery of the first thing built．
In most projects,the first system built is （71） usable,It may be too slow,too big,awkward to use,or all three．There is no （72） but to start again,smarting but smarter,and build a redesigned version in which these problems are solved．The discard and （73） may be done in one lump,or it may be done piece-by-piece．But all large-system experience shows that it will be done．Where a new system concept or new technology is used,one has to build a system to throw away,for even the best planning is not so omniscient（全知的）as to get it right the first time．
The management question,therefore ,is not whether to build a pilot system and throw it away．You will do that．The only question is whether to plan in advance to build a （74）,or to promise to deliver the throwaway to customers．Seen this way,the answer is much clearer．Delivering that throwaway to customers buys time,but it does so only at the （75） of agony（极大痛苦）for the user,distraction for the builders while they do the redesign,and a bad reputation for the product that best redesign will find hard to live down．
Hence plan to throw one away;you will,anyhow．
71.()
按照植物和水分的关系把植物分为______、______和______三种类型。
松属的针叶分为______、______、______和______四部分。
2011年1月1日，长江股份有限公司以银行存款2800万元取得A股份有限公司（以下简称A公司）60%的股份，当日A公司可辨认净资产账面价值为3500万元，可辨认净资产公允价值为4000万元，差额为合并时A公司一项管理用固定资产所引起的。当日，该项固定资产原价为900万元，已计提折旧200万元，公允价值为1200万元，采用年限平均法计提折旧，预计净残值为零，预计尚可使用年限为10年。长江公司与A公司在此之前不存在关联方关系，不考虑其他因素，则该项固定资产在2011年编制的合并财务报表中应列示的金额为（）万元。
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